n = 100
 
sum = 0
counter = 1
while counter <= n:
    sum = sum + counter
    counter += 1
 
print("1 到 %d 之和为: %d" % (n,sum))

sites = ["Baidu", "Google","Runoob","Taobao"]
for site in sites:
    print(site)

word = 'runoob'
 
for letter in word:
    print(letter)

#break continue 同样可用

# Python pass是空语句，是为了保持程序结构的完整性。

# pass 不做任何事情